Power transmission



' Patented Dec. 2, 1924.

7 UNITED STATES AUGUSTUS I. KLASING, OF CHICAGO, ILLINOIS, ASSIGNOR TOTHE KLASING BRAKE COMPANY, A CORPORATION OF COLORADO.

CAR

POWER TRANSMISSION.

Application filed June 7-,

To all whom it may concern."

of the United States of America, have in- CID vented a certain new anduseful Improvement in Power Transmissions, of which the following is aspecification.

My invention relates to improvements in power transmission in which abell crank lever is used to transmit the power. 'Among my primaryobjects is the compounding of movements-in one operation so as toaccomplish the most immediate take-up of slack and the mostinstantaneous release. I also contemplate the concentration in a simplesingle device the largest number of contracting movements. A morespecific object is the production of a mechanism for use in car brakes.It is well known in the art that a certain amount of slackexists as aprimary condition between the point of powerutilization and the point ofpower delivery in all car braking mechanism. In all such cases it isessential that the slack be taken up in the shortest space of time andin a comparat-ivel small area while developing and deliverlng thedesired power. A converse necessity in power transmitting apparatus ofthis character is to obtain the nearest possible approach toinstantaneous efiicient release.

This application as to its broad claims is related to my priorapplication, Serial No. 220,467 filed March 5, 1918; and my applicationSerial No. 260,018 filed October 28, 1918, the general principles hereinillustrated and claimed being originally illustrated in combination inthe said applications.

My invention consists primarily of a bellcrank-lever and its adaptationas set forth in the following specifications.

Fig. 1 shows the device in its initial stage of actuation.

Fig. 2 is a perspective of the device in its ultimate position ofdelivery.

Fig. 3 is a sectional view of the fulcrum.

Fig. 4 is a side view of the lever. I

In the device as shown, the reference numeral 1 designates a fulcrummember adapted to be fixedly attached to some part of a car or othermechanism. The fulcrum member is provided with a tooth rack 2 whichprojects at an angle from the base, and is provided with a pair offlanges 3 which enclose the tooth rack 2. The inner 1919. Serial No.302,566. I

faces of the flanges 3. are provided with guideways 4 which extend from"the end of theflanges nearest the base of the fulcrum 1 to a point nearthe other end of the flanges and are adapted-to receive and retain anaxis 8 to be hereinafter described. A screw bolt is adapted to beinserted in the threaded opening 5 after the bell-crank is positioned inthe guideways, and to project downwardly so as to prevent the removal ofthe bell crank from the guideways. A bellcrank-lever 6, having amutilated spur gear 7 as the pivotal point thereof, is provided adjacentto said gear 7 with trunnions 8 adapted to fit movably in the guidewayst. The power arm 9 of the bell-crank 6 is provided with an attachingpoint 10 to which a suitable operating rod is secured. The powerdelivery arm 12 of said bell crank 6 is provided with a chain attachingpoint 11 which is preferably located at a point on.

the power arm 12 at one end of an elliptical segment 13. The segment 13is designed with the arc of greatest radius with respect to the pivotpoint adjacent to the point of chain attachment 11 so as to securequickest draught at initial actuation and to have the arc of smallestradius at the opposite end of the segment so as to secure theapplication of the greatest. force on the chain or other draft element.,This segment 13 described upon the arm 12 has a channel 14 providedupon its face to receive a chain, and give to said chain a changingpoint of draft.

In the assembly of said device the bellcrank 6 is brought into contactwith the fulcrum l by inserting the same in the guideways 4 at such aposition that the tooth 7 meshes with the rack 2 at 2*, audit will beapparent that as the bell-crank is functioned the gear teeth 7 willadvance along the rack 2 until the fulcrum point has reached theextremity of the rack 2.

The operation of the device is as follows: Force, such as an upward pullapplied to the arm 6 at the point 10, causes the bellcrank to rock andat the same time travel bodily down the inclined rack 2. This has theeffect of increasing the travel of the draft element or chainattached-at thepoint 11, over that resulting merely from the rocking ofthe bell crank. In addition the chain winds in effect on the curvedsegment 13. Asdescribed above, this segment is so roportioned that theeffective length. of the through an angle, comprising a bell crank leverhaving meansat the ends thereof lever arm 12 gradually diminishes as thebell crank rocks, so as to permit the application of a greater pull ator, near the end of the travel. Upon a reverse movement of the arm 6 thebell-crank travels upwardly on the rack and toward the point of deliveryfor the application of the pull and a fulcrum intermediate its ends andmeans for causing the fulcrum of the lever to travel in a directionopposite to the direction of pull on said bell crank.

2. In a. device for transmitting power through an angle, the combinationof a-lever having a fulcrum intermediate its ends and means on saidlever for the application of power, a base for said lever and means forcausing said fulcrum to travel on said base in a direction oblique,tothe directions .of the pulls applied to and transmitted by said bellcrank. o

, 3. In a device for transmitting power through an angle, thecombination of a bell crank having a moving fulcrum intermediate itsends, a base for said bell crank and means on said base for guiding themovement of said fulcrum on said base.

4. In a ,device for transmitting power through an angle, the combinationof a bell crank having a curved rack as a fulcrum, intermediate itsends, a base for said bell crank having a rack, with which said curvedrack meshes for causing said fulcrum to move duringthe oscillation ofsaid bell crank.

5. In a device for transmitting power through an angle, the combinationof a bell crank having a curved rack as a fulcrum intermediate its ends,a base for said bell crank having a rack inclined in a direction opposedto the lines of transmission of power and with which said curved rackmeshes.

6. In a device for transmitting power through an angle, the combinationof a bell crank having a curved rack as a fulcrum intermediate its ends,a base for said bell crank having a rack inclined in a direction atangles to the lines of transmission of power and with which said curvedrack meshes, and means for retaining said bell crank in mesh with saidrack.

7. A rocking and rolling transmission device comprisingin combination abell crank lever provided with laterally projecting trunnions, anarcuate pinion adjacent said trunnions, and a "fixed supporting memberconsisting of a channel shaped member having an interiorrack formedtherein adapted to mesh with said pinion, and internal recesses in theside members of said channel for receiving said trunnions.

8. A power transmission device comprising in combination a bell cranklever having a pair of arms and an intermediate fulcrum, means forapplying power to one of said arms, a winding surface on the other arm,upon which a flexible element is adapted to wind during the transmissionof power, and means for causing the fulcrum of said lever to travelbodily in a direction away from the directions of the pulls applied toand transmitted by said bell' crank. '9, A power transmission devicecomprising in combination a rocking transmission element consisting of abell crank having thereon a curved rack intermediate its ends,astationary rack upon which said curved rack is adapted to travel whensaid transmission element rocks, means for applying power tosaidtransmission element and means comprising a winding surface fordelivering the transmitted power, said stationary rack being sopositioned with respect to the direction of pull that the transmissionelement will travel in a direction opposed to that of the application ofpower durin the transmission ofpower.

10. 111 a power transmission device, in combination, a rockingtransmission element comprisin a pair of. lever arms and having a toot.ed pinion at the fulcrum there of, a stationary rack upon which saidpinion is adapted to roll when said transmission element is rocked, oneof said lever arms .a segmental gear intermediate 'its ends, a

rack on which said gear is adapted to roll,

and transmission members attached to opposite ends of said lever,

12. In combination a bell crank having a segmental gear intermediate itsends, a rack on \Which said gear is adapted to .roll, :1 pull rodattached to one end of saidlever, and a chain attachedto and adapted towind upon the other end of said lever.

13. In combination a bell crank having a segmental gear intermediate itsends, a rack on which said gear is adapted to roll, and transmissionmembers attached to op posite ends of said. lever and adapted to move inthe direction oft-heir length, said rack being oblique t0"saiddirections of movement of said transmission members.

14. In combination an inverted channel shaped member having a rack onits under surface andlongitudinally arranged recesses in its sideflange, a bell crank having a segmental gear intermediate its ends tomesh with said rack and trunnions concentric with said gear to entersaid recesses, and transmission elements connected with the ends of saidbell crank respectively. I

15. In combination an inverted channel shaped member having an inclinedrack on its under surface and longitudinally arranged recesses in itsside flange parallel with said rack, a bell crank having a segmentalgear intermediate its ends to mesh with said rack and trunnionsconcentric with said gear to enter said recesses and transmissionelements connected with the ends of said bell crank respectively.

16. In combination an inverted channel shaped member having an inclinedrack on its under surface and longitudinally arranged recesses in itsside flanges parallel With said rack, a bell crank having a segmentalgear intermediate its ends to mesh with said rack and trunnionsconcentric QNltll said gear to enter said recesses and transmissionelements connected with the ends of said bell crank respectively, one ofsaid transmission elements consisting of a pull rod pivoted to the bellcrank and the other consisting of a chain adapted to Wind upon the otherend of said bell crank said rack being directions of movement of saidpull rod and chain.

Signed at Chicago, Illinois, June 2, 1919.

I AUGUSTUS F. KIJASING.H

disposed obliquely to the

